mbtserver: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/mbtserver - from package: mbtserver

You may install the required package with command apt-get install {package}
Error in other languages:
mbtserver: bevel nie gevind nie
mbtserver: comandă negăsită
mbtserver: comando não encontrado
mbtserver: commande introuvable
mbtserver: command not found
mbtserver: käsku ei ole
mbtserver: không tìm thấy lệnh
mbtserver: komanda nerasta
mbtserver: Kommando nicht gefunden.
mbtserver: kommandot finns inte
mbtserver: komut yok
mbtserver: nie znaleziono polecenia
mbtserver: níor aimsíodh an t-ordú
mbtserver: no se encontró la orden
mbtserver: no s'ha trobat l'ordre
mbtserver: opdracht niet gevonden
mbtserver: parancs nem található
mbtserver: perintah tidak ditemukan
mbtserver: príkaz nenájdený
mbtserver: příkaz nenalezen
mbtserver: команда не найдена
mbtserver: командата не е открита
mbtserver: 命令找不到
mbtserver: コマンドが見つかりません